# Relationship history for MSHA mine 1302343

Current hierarchy: **Rasmussen Group Inc → Viking Aggregates, Inc. → Kahoka Portable Wash Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Johnson Holding Company → Kahoka Portable Wash Plant; 1991-03-15 to 2024-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Viking Aggregates, Inc. → Kahoka Portable Wash Plant; 2007-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Holding Company → Viking Aggregates, Inc.; 2007-04-13 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → Kahoka Portable Wash Plant; 2024-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rasmussen Group Inc → Viking Aggregates, Inc.; 2024-04-19 to current/open; source msha-controller-operator-history